I'm an 0L and I'm buying all the E & E's now so I can start using them when the semester starts. However on Amazon, most of the descriptions of the books say they don't come with valid codes that accompany the books. How necessary are these?

Horchata wrote:I'm an 0L and I'm buying all the E & E's now so I can start using them when the semester starts. However on Amazon, most of the descriptions of the books say they don't come with valid codes that accompany the books. How necessary are these?

Gracias

No

also, don't buy them yet. get the free amazon prime account and then ask the professor which supplement(s) to get. Free 2 day shipping on amazon is great during the year